60 ANTISEPTICS AND DISINFECTANTS. 



twelve hours, after which the doors and windows are thrown 

 wide open and the room thoroughly aired. The number of 

 sheets required will depend on the size of the room. In a 

 room 10 X 10 feet two sheets will suffice. All crevices, 

 keyholes, etc., should be packed with cotton, so that none of 

 the vapor will escape. 



Novy's and the " Central " formaldehyde generator, and 

 Schering's lamp, are exceedingly simple in construction and 

 inexpensive. Others, like Trillat's autoclave, are complicated 

 and expensive. Either the apparatus is placed in the room, 

 or the vapor is sent in through the keyhole by means of a 

 supply-tube. The temperature of the room should be about 

 21 C., and it should contain sufficient moisture. 



Sulphate of copper is an excellent and at the same time a 

 very cheap disinfectant. It is not irritating and has no odor. 

 It is especially valuable for the disinfection of typhoid stools. 

 A pound of the sulphate is dissolved in 2J gallons of water, 

 and a pint of this solution is kept constantly in the vessel 

 which receives the discharges from both bowels and bladder. 

 The poison is destroyed in fifteen minutes if the infected 

 material is mixed thoroughly with the solution. 



